单项选择题
A.4~10cmH2O B.5~12cmH2O C.6~14cmH2O D.5~10cmH2O
A.1%~2% B.2%~3% C.3%~4% D.4%~5%
A.30℃~32℃ B.31℃~33℃ C.32℃~35℃ D.33℃~36℃
A.2小时B.3小时C.4小时D.5小时
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